300+ TOP MCQs on Electric flux and Answers

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MCQs on Electric flux :

1. What is the value of total flux through the faces of the cube with the sides of length a if a charge Q is placed at corner A of the cube is

(A) q/ε₀
(B) q/2ε₀
(C) q/4ε₀
(D) q/8ε₀

Answer

Answer: (D) q/8ε₀

2. If a unit positive charge is kept in the air. Then the total flux coming out of unit charge is
(A) 4πε₀^-1
(B) 4πε₀
(C) ε₀^-1
(D) ε₀

Answer

Answer: (C)ε₀^-1

3. What is the value of electric flux (Φ) on a plane of area 1m² on which an electric field of 2 V/m crosses with an angle of 30⁰.
(A) 1 Vm
(B) 2 Vm
(C) 3 Vm
(D) 4 Vm

Answer

Answer: (A) 1 Vm

4. Determine the electric flux of a flat square having an area of 10m² is a uniform electric field of 8000 N/C passing perpendicular to it
(A) 8 x 10⁵ Nm^2/C
(B) 8 x 10⁴ Nm²/C
(C) 16 x 10⁵ Nm²/C
(D) 4 x 10⁴ Nm²/C

Answer

Answer: (A) 8 x 10⁵ Nm^2/C

5. A plane surface is rotated in a uniform electric field. When is the flux of the electric field through the surface maximum?
(A) When the surface is perpendicular to the field
(B) When the surface is parallel to the field
(C) When the surface is at an angle of 30⁰ with the field
(D) When the surface is at an angle of 45⁰ with the field

Answer

Answer: (A) When the surface is perpendicular to the field

6. When is the flux through a surface taken as positive
(A) When the flux lines are directed inwards
(B) When the flux lines are directed outwards
(C) No flux lines through the surface
(D) Flux lines are parallel to each other

Answer

Answer: (B) When the flux lines are directed outwards

7. The net charge through a closed surface in a given medium depends on
(A) Size of the surface
(B) Charge of the surface
(C) The shape of the surface
(D) Area of the surface

Answer

Answer: (B) Charge of the surface

8. The dimension of electric flux is
(A) [M²L²T³A¹]
(B) [MLT^-3A^-1]
(C) [M³L³T^-3A^-1]
(D) [ML³T ^-3A^-1]

Answer

Answer: (D) [ML³T ^-3A^-1]

9. The electric flux through a cubical Gaussian surface enclosing net charge q is q/ε_0. While the electric flux through one face of a cube is
(A) q/ε₀
(B) q/6ε₀
(C) q/4πε₀
(D) q/4ε₀

Answer

Answer: (B) q/6ε₀

10. A point charge q is placed at a distance a/2 directly above the centre of the square of side a. The electric flux through the square is
(A) q/ε₀
(B) q/6ε₀
(C) q/4πε₀
(D) q/4ε₀

Answer

Answer: (B) q/6ε₀
Explanation : Imagine a cube with charge q at the centre and the given square is one of its faces. So electric flux through the given square( one face) q/6ε₀